And perhaps I have an additional info as well. Trying xine with the params VDPAU_TRACE=1 and VDPAU_NVIDIA_DEBUG=3 on Quadro FX580, I found in logs this:
This is xine (X11 gui) - a free video player v0.99.6.
(c) 2000-2007 The xine Team.
VDPAU nvidia: Version: NVIDIA VDPAU Driver Shared Library 260.19.12 Fri Oct
8 11:46:03 PDT 2010
VDPAU nvidia: Error detected 1 426
VDPAU nvidia: Backtrace:
--: /usr/lib64/libvdpau_nvidia.so.1 [0x7f9bb3c30000] DSO load base
00: /usr/lib64/libvdpau_nvidia.so.1 [0x7f9bb3c47025]
01: /usr/lib64/libvdpau_nvidia.so.1 [0x7f9bb3c434c7]
02: /usr/lib64/libvdpau_nvidia.so.1 [0x7f9bb3c4064c]
I do not know, if it is directly related to the 'xine' problem, because mplayer produces the same error but it works... But this error seems to be quite close to that of KCat.